\( \sin 2 \mathrm{~A}=2 \sin \mathrm{A} \) तब सत्य होता है, जबकि \( \mathrm{A} \) बराबर है:
(A) ...
\( \sin 2 \mathrm{~A}=2 \sin \mathrm{A} \) तब सत्य होता है, जबकि \( \mathrm{A} \) बराबर है:
(A) \( 0^{\circ} \)
(B) \( 30^{\circ} \)
(C) \( 45^{\circ} \)
(D) \( 60^{\circ} \)
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